3M is Broke!
And it's my fault. I called and asked if I should use Super 77 or 90 to bond sheet fiberglass on a camper to wood, specifically underlayment/luan. Then..I asked..What is the cure time and at what t...
Forum Discussion
Gjac wrote:
Those are contact adhesives as westend said, they bond instantly after you let both sides tack up. They have a high solvent content that flashes of very quickly that allows this quick curing. I am not sure what you are bonding but if you are bonding the exterior luan to the exterior FG skin that adhesive will soften at about 150 degrees F. So if your are siting in the sun for along time an epoxy would be a better choice. Epoxy adhesives are usually 300 or a little higher before they soften and begin to loose strength.
Ditto - I used to use them a lot for laminating wood to foam for very large model airplanes. Learned my lesson when at a contest on a hot sunny day, and the wings bowed due to delamination. You would be very surprised as to what the "skin" temperature will get to on an RV sitting out in the sun. Use epoxy!
